Depression/ alcoholism?

Im 19 and had depression for what i believe 3 years without getting help ive found drinking and smoking my way of coping with it for the last 2 years, though i wouldnt drink alot id still have a drink every other day and probably 15 fags/cigs a day. I have stopped both for last 2 months and other then feeling down i cannot control my anger though i no it is no excuse, i have got such a short fuse now how can i cope with this and not shout and family and my girlfriend i dont want to lose her as shes only reason i didnt overdose talking to her is main way im coping with it but i keep losing my temper easily though of course id never lay a finger on her before you say id never hurt her. what can i do to take my mind of feeling angry or sad?